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Turbulent heating in galaxy clusters brightest in X-rays

26-10-2014 | I. Zhuravleva; E. Churazov; A. A. Schekochihin; S. W. Allen; P. Arévalo; A. C. Fabian; W. R. Forman; J. S. Sanders; ..., Nature, 2014

Nature advance online publication 26 October 2014. doi:10.1038/nature13830 Authors: I. Zhuravleva, E. Churazov, A. A. Schekochihin, S. W. Allen, P. Arévalo, A. C. Fabian, W. R. Forman, J. S. Sanders, A. Simionescu, R. Sunyaev, A. Vikhlinin & N. Werner The hot (107 to 108kelvin), ...

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N‐Heterocyclic Carbene Formation Induced Fluorescent and Colorimetric Sensing of Fluoride Using Perimidinium Derivatives

24-10-2014 | Dawei Zhang, Haiqiang Yang, Alexandre Martinez, Kelsey Jamieson, Jean‐Pierre Dutasta, Guohua Gao, Chemistry - A European Journal, 2014

Abstract In this study, two perimidinium derivatives (1 and 2) were designed, synthesized, and developed as efficient fluorescent and colorimetric chemodosisensors for F− in DMSO or more competitive media (DMSO containing 10 % water). In the presence of F−, the yellow and non‐fluorescent ...

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Reactions of the Donor‐Stabilized Silylene Bis[N,N′‐diisopropyl‐benzamidinato(−)]silicon(II) with Brønsted Acids

24-10-2014 | Konstantin Junold, Katharina Sinner, Johannes A. Baus, Christian Burschka, Célia Fonseca Guerra, F. Matthias Bickelh ..., Chemistry - A European Journal, 2014

Abstract Reaction of the donor‐stabilized silylene 1 (which is three‐coordinate in the solid state and four‐coordinate in solution) with [HMCp(CO)3] (M=Mo, W; Cp=cyclopentadienyl) leads to the cationic five‐coordinate silicon(IV) complexes 2 and 3, respectively, and reaction of 1 with CH3COOH ...

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Corrosion behavior of new ternary zirconium alloys as alternative materials for biomedical applications

24-10-2014 | F. Rosalbino, D. Macciò, G. Scavino, A. Saccone, Materials and Corrosion, 2014

The in vitro corrosion behavior of four Zr‐based alloys (Zr97.5Nb1.5VM1.0; VM = valve metal: Ti, Mo, W, Ta; at%) to be used as implant materials has been assessed and compared with that of Grade 2 Ti, which is known to be a highly compatible metal standard. Corrosion resistance was investigated ...

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Enantiopure Laterally‐Functionalized Alleno–Acetylenic Macrocycles: Synthesis, Chiroptical Properties, and Self‐Assembly in Aqueous Media

24-10-2014 | Manolis D. Tzirakis, Mariza N. Alberti, Haim Weissman, Boris Rybtchinski, François Diederich, Chemistry - A European Journal, 2014

Abstract A family of shape‐persistent alleno–acetylenic macrocycles (SPAAMs), peripherally decorated with structurally diverse pendant groups, has been synthesized and characterized in enantiomerically pure form. Their electronic circular dichroism (ECD) spectra feature a strong chiroptical ...

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Silver Seeds and Aromatic Surfactants Facilitate the Growth of Anisotropic Metal Nanoparticles: Gold Triangular Nanoprisms and Ultrathin Nanowires

24-10-2014 | Zhaoxia Qian; So-Jung Park, Chemistry of Materials, 2014

Here, we report that the introduction of silver seeds can lead to fast and high-yield syntheses of two highly anisotropic metal nanoparticles: triangular gold nanoprisms and ultrathin metal nanowires. Uniform sub-50 nm gold triangular nanoprisms were formed in high yields when silver seeds were ...

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Exclusive Selectivity in the One-Pot Formation of C–C and C–Se Bonds Involving Ni-Catalyzed Alkyne Hydroselenation: Optimization of the Synthetic Procedure and a Mechanistic Study

23-10-2014 | Nikolay V. Orlov; Igor V. Chistyakov; Levon L. Khemchyan; Valentine P. Ananikov; Irina P. Beletskaya; Zoya A. Starikova, The Journal of Organic Chemistry, 2014

A unique Ni-catalyzed transformation is reported for the one-pot highly selective synthesis of previously unknown monoseleno-substituted 1,3-dienes starting from easily available terminal alkynes and benzeneselenol. The combination of a readily available catalyst precursor, Ni(acac)2, and an ...

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Can Lowering the Injection Brine Salinity Further Increase Oil Recovery by Surfactant Injection under Otherwise Similar Conditions?

23-10-2014 | Annette Meland Johannessen; Kristine Spildo, Energy & Fuels, 2014

It is well-established that injecting water with significantly lower salinity than the formation water salinity may give increased oil recovery. Although less well studied, the observed low-salinity effect has drawn attention to possible benefits from combining low-salinity water with traditional ...

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Protonation of a Biologically Relevant CuII μ‐Thiolate Complex: Ligand Dissociation or Formation of a Protonated CuI Disulfide Species?

22-10-2014 | Erica C. M. Ording‐Wenker, Martijn van der Plas, Maxime A. Siegler, Célia Fonseca Guerra, Elisabeth Bouwman, Chemistry - A European Journal, 2014

Abstract The proton‐induced electron‐transfer reaction of a CuII μ‐thiolate complex to a CuI‐containing species has been investigated, both experimentally and computationally. The CuII μ‐thiolate complex [CuII2(LMeS)2]2+ is isolated with the new pyridyl‐containing ligand LMeSSLMe, which can ...

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Asphaltene Subfractions Responsible for Stabilizing Water-in-Crude Oil Emulsions. Part 1: Interfacial Behaviors

22-10-2014 | Fan Yang; Plamen Tchoukov; Erica Pensini; Tadeusz Dabros; Jan Czarnecki; Jacob Masliyah; Zhenghe Xu, Energy & Fuels, 2014

The asphaltene fraction of crude oil is commonly considered to be responsible for the formation of highly undesirable, stable water-in-crude oil emulsions and rag layers. We developed a new procedure for subfractionation of asphaltenes based on their interfacial activity. The most interfacially ...

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